{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63850",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.016Z",
        "datePublished": "2026-07-19T14:04:41.975Z",
        "dateUpdated": "2026-08-05T12:36:28.456Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:36:28.456Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v5.0.0 enc ring\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit 49b1fbbb5a071197ee71e2d70959b1cb29bdc317)"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable code is reached via the local DRM_IOCTL_AMDGPU_CS ioctl on an AMDGPU render node (/dev/dri/renderD*), submitting a command buffer with AMDGPU_CHUNK_ID_FENCE to the VCN v5.0.0 encoder ring.\nAC:L - An attacker with render-node access can deterministically submit a VCN encoder CS with a user-fence chunk; no race, special memory layout, or non-default kernel configuration is required beyond having affected AMD VCN 5.0.0 hardware.\nPR:L - Exploitation requires access to the AMDGPU DRM render node, which is available to unprivileged local users in the render/video group (or equivalent GPU access), not root or capabilities obtainable only in the init namespace.\nUI:N - No victim interaction is needed beyond the attacker already having GPU render-node access; exploitation is fully attacker-driven through ioctl submission.\nS:U - Impact is kernel/GPU memory corruption and privilege escalation within the same host security boundary; it does not inherently cross a VM, container, or IOMMU isolation boundary.\nC:H - Submitting an unsupported 64-bit user fence causes the VCN hardware to perform misdirected GPU memory writes, providing a memory-corruption primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The malformed fence write gives the attacker a GPU-initiated arbitrary write primitive within the GPU virtual address space, enabling memory corruption and potential kernel code execution.\nA:H - Malformed VCN fence commands can hang the GPU, trigger kernel oopses, or crash the system when the unsupported fence operation is processed by hardware."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c"
                    ],
                    "versions": [
                        {
                            "version": "b6d1a06320519ac3bfda6ce81067a1bc409b9cff",
                            "lessThan": "9f5a1459ecc3195282be617639d710b54779c9dc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b6d1a06320519ac3bfda6ce81067a1bc409b9cff",
                            "lessThan": "139a8a52ef4349c62129703b3a3e3a6ae4d634eb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b6d1a06320519ac3bfda6ce81067a1bc409b9cff",
                            "lessThan": "2c350f3cd94be847ac216e1358ec7001eaaf0934",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b6d1a06320519ac3bfda6ce81067a1bc409b9cff",
                            "lessThan": "8cae0ce77de492d7c31c1532a2e80c0c6e7e58cb",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.91",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.12.91"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.18.33"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "7.0.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/9f5a1459ecc3195282be617639d710b54779c9dc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/139a8a52ef4349c62129703b3a3e3a6ae4d634eb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2c350f3cd94be847ac216e1358ec7001eaaf0934"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8cae0ce77de492d7c31c1532a2e80c0c6e7e58cb"
                }
            ],
            "title": "drm/amdgpu/vcn: set no_user_fence for VCN v5.0.0 enc ring",
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}